*{
    box-sizing: border-box;
}
html,body,div{
    margin: 0;
    padding: 0;
}

body{
    background: #000;
    color: #fff;
}

.game-container, .start-container{
    position: relative;
    box-sizing: content-box;
    height: 600px;
    width: 590px;
    margin: 0 auto;
    margin-top: 50px;
    border: 1px solid green;
}

.game-container{
    display: none;
}

.start-container{
    background: url(../images/bg_start.png);
    background-size: cover;
    width: 390px;
    padding-top: 280px;
    box-sizing: border-box;
}

.start-container p{
    text-align: center;
    margin-top: 40px;
}

.start-container p button{
    width: 200px;
    height: 50px;
    line-height: 50px;
    font-size: 20px;
    font-family: 微软雅黑;
    border: 0;
    border-radius: 50%;
    outline: none;
    cursor: pointer;
    background: lightblue;
}

.start-container p button:hover{
    background: lightcoral;
}

.game-main-panel{
    position: absolute;
    left: 100px;
    top: 0;
    width: 390px;
    height: 600px;
    border-left: 1px solid green;
    border-right: 1px solid green;
}
.timer-panel{
    position: absolute;
    top: 0;
    left: 0;
    width: 100px;
    height: 100px;
}
.help-panel{
    position: absolute;
    top: 150px;
    left: 0;
    width: 100px;
}
.level-panel{
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100px;
    height: 100px;
}
.next-panel{
    position: absolute;
    right: 0;
    top: 0;
    width: 100px;
    height: 100px;
}
.setting-panel{
    position: absolute;
    top: 150px;
    right: 0;
    width: 100px;
}
.score-panel{
    position: absolute;
    right: 0;
    bottom: 120px;
    width: 100px;
    height: 100px;
}
.high-score-panel{
    position: absolute;
    right: 0;
    bottom: 0;
    width: 100px;
    height: 100px;
}
.panel-header{
    height: 30px;
    line-height: 30px;
    padding-left: 5px;
    font-size: 18px;
    color:#fff;
    background: lightsalmon;
}
.panel-body{
    text-align: center;
    line-height: 70px;
}
.help-panel .panel-body,
.setting-panel .panel-body{
    line-height: normal;
}
.timer-panel, .next-panel, .score-panel{
    border-bottom: 1px solid green;
}

.modal-dialog{
    display: none;
}

.modal-dialog .modal-body{
    position: fixed;
    height: 300px;
    width: 390px;
    top: 50%;
    margin-top: -150px;
    left: 50%;
    margin-left: -195px;
    background: #000;
    z-index: 100;
    text-align: center;
}

.modal-dialog::after{
    content: '';
    position: fixed;
    top:0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(255,255,255,0.3);
}